<template>
    <!-- 面板屑导航 -->
    <el-breadcrumb separator=">">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card class="box-card">
      <!-- 搜索与添加区域 -->
        <el-row :gutter="20">
            <el-col :span="8">
                <el-button type="primary">添加角色</el-button>
            </el-col>
        </el-row>
        <!-- 角色列表 -->
        <el-table :data="rolelist" border stripe>

            <!-- 展开列 -->
            <el-table-column type="expand">
                <template #default="scope">       
                    <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row, item1.id)">
                                {{item1.authName}}
                            </el-tag>
                            <el-icon><CaretRight /></el-icon>
                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type="success" closable
                                    @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                    <el-icon><CaretRight /></el-icon>        
                                </el-col>
                                <el-col :span="18">
                                    <el-tag type="warning" v-for="(item3) in item2.children"
                                    :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template #default="scope">
                    <!-- 编辑按钮 -->
                    <el-button type="primary" size="small" >
                    <el-icon><Edit /></el-icon>&nbsp;编辑
                    </el-button>
                    <!-- 删除按钮 -->
                    <el-button  type="danger" size="small" >
                    <el-icon><Delete /></el-icon>&nbsp;删除
                    </el-button>
                    <!-- 分配权限按钮 -->
                    <el-button type="warning" size="small" @click="showSetRightDialog(scope.row)">
                        <el-icon><Setting /></el-icon>&nbsp;分配权限
                    </el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
    v-model="setRightDialogVisible"
    title="分配权限"
    width="50%"
    @close="setRightDialogClosed"
    >
    <!-- 树形控件 -->
    <el-tree :data="rightslist" :props="treeProps" 
    show-checkbox node-key="id" default-expand-all 
    :default-checked-keys="defKeys" ref="treeRef"/>
        <template #footer>
        <span class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">
            取消
            </el-button>
            <el-button type="primary" @click="allotRights">
            确定
            </el-button>
        </span>
        </template>
    </el-dialog>

</template>

<script>
import { ElMessage, ElMessageBox } from 'element-plus'
export default {
    data() {
        return {
            // 所有角色列表数据
            rolelist: [],
            // 分配权限对话框的显示
            setRightDialogVisible: false,
            // 获取权限的数据
            rightslist: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children:'children'
            },
            // 默认选中的节点Id值数组
            defKeys: [],
            // 当前即将分配权限的角色id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        async  getRolesList() {
            const { data: res } = await this.$http.get('roles')

            if (res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败')
            }

            this.rolelist = res.data
        },

        async removeRightById(role, rightId) {
            // 弹框提示用户是否要删除
            const confirmResult = await ElMessageBox.confirm(
                '将永久删除该文件，是否继续',
                '提示',
                {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning',
                }
            ).catch(err => err)

            if (confirmResult !== 'confirm') {
                return this.$message.info('取消删除')
            }

            const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除失败')
            }
            role.children = res.data
        },

        // 控制展示分配权限对话框
        async showSetRightDialog(role) {
            console.log(role)
            this.roleId = role.id
            const { data: res } = await this.$http.get('rights/tree')

            if (res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败')
            }

            this.rightslist = res.data

            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },

        // 通过递归的形式，获取角色下所有三级权限id，并保存
        getLeafKeys(node, arr) {
            if (!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item =>
            this.getLeafKeys(item, arr))
        },

        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },

        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            console.log(keys)
            const idStr = keys.join(',')
            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
            if (res.meta.status != 200) {
                return this.$message.error('分配权限失败!')
            }
            this.$message.success('分配权限成功!')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}

.bdtop{
    border-top: 1px solid #eee;
}

.bdbottom{
    border-bottom: 1px solid #eee;
}

.vcenter{
    display: flex;
    align-items: center;
}

</style>